數(shù)組適配器（ArrayAdapter）

• 需要傳的參數(shù)類(lèi)型

• 實(shí)現(xiàn)效果：

  
  
  效果圖

• 需要的java代碼：

package com.example.demo2;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.content.res.Resources;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private ListView lv_city;
    private String[] arrCity;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Resources resources = getResources();//獲取系統(tǒng)資源對(duì)象
        arrCity = resources.getStringArray(R.array.city);//通過(guò)資源對(duì)象獲取資源
        lv_city= findViewById(R.id.lv_city);
        //定義適配器
        ArrayAdapter<String> adapter=new ArrayAdapter<>(
                this,
                android.R.layout.simple_list_item_1,
                arrCity
        );
        lv_city.setAdapter(adapter);
        lv_city.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                Toast.makeText(MainActivity.this, arrCity[i], Toast.LENGTH_LONG).show();
            }
        });
    }

• 需要的xml代碼

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">
    <ListView
        android:id="@+id/lv_city"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
    </ListView>
</LinearLayout>

• 在value文件下創(chuàng)建一個(gè)存放數(shù)組類(lèi)型的xml文件

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="city">
        <item>北京</item>
        <item>廣州</item>
        <item>成都</item>
    </string-array>
</resources>

簡(jiǎn)單適配器（SimpleAdapter）

• 參數(shù)類(lèi)型

  
  
  參數(shù)類(lèi)型
• 需要注意的幾點(diǎn)

• List<? extends Map<String,?>> data :泛型
  HashMap繼承Map
  ？：代表任意類(lèi)型（object）
  定義：
  private List<HashMap<String,Object>> data =new ArrayList<>();
• 第三個(gè)參數(shù),為L(zhǎng)ist的layout,需要在layout文件夾中添加對(duì)應(yīng)的layout
• 第四個(gè)參數(shù)列表和第五個(gè)參數(shù)列表應(yīng)一一對(duì)應(yīng)

• 實(shí)現(xiàn)效果

  
  
  效果圖

• 需要的java代碼

package com.example.demo2;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleAdapter;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

public class FirstActivity extends AppCompatActivity {
    private ListView lv_person;
    private List<HashMap<String,Object>> data =new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_first);

        for (int i=0;i<5;i++){
            HashMap<String,Object> map=new HashMap<>();
            //鍵值對(duì)，Key：為String類(lèi)型，value：為任何類(lèi)型
            map.put("head",R.mipmap.ic_launcher);
            map.put("name","馮"+i);
            map.put("info","哈哈哈哈"+i);
            map.put("time","20:0"+i);

            data.add(map);
        }

        lv_person=findViewById(R.id.lv_person);
        SimpleAdapter adapter=new SimpleAdapter(
                this,
                data,
                R.layout.item,
                new String[]{"head","name","info","time"},
                new int[]{R.id.iv_head,R.id.tv_name,R.id.tv_info,R.id.tv_time}

        );
        lv_person.setAdapter(adapter);
    }
}

• 需要的java所對(duì)應(yīng)的xml代碼

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".FirstActivity">
    <ListView
        android:id="@+id/lv_person"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

    </ListView>

</LinearLayout>

• 需要的Hashmap所對(duì)應(yīng)的xml代碼

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="5dp">

    <ImageView
        android:id="@+id/iv_head"
        android:src="@mipmap/ic_launcher"
        android:layout_width="80dp"
        android:layout_height="80dp" />
    <TextView
        android:layout_marginTop="10dp"
        android:layout_toRightOf="@id/iv_head"
        android:layout_marginLeft="20dp"
        android:id="@+id/tv_name"
        android:text="掌聲"
        android:textSize="20sp"
        android:textColor="#000"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <TextView
        android:layout_marginTop="10dp"
        android:layout_toRightOf="@id/iv_head"
        android:layout_alignBottom="@id/iv_head"
        android:layout_marginLeft="20dp"
        android:id="@+id/tv_info"
        android:text="哈哈哈哈哈"
        android:textSize="14sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <TextView
        android:textSize="14sp"
        android:text="20：00"
        android:id="@+id/tv_time"
        android:layout_marginTop="10dp"
        android:layout_alignParentRight="true"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</RelativeLayout>